Large Five Layer Performance Air Filter This 7 tall 360 - degree radial flow air filter features a 3 - 12 flange and our pre - oiled Pro 5R media with five layers of progressively finer cotton gauze media for maximum performance. It provides your engine with the largest amount of high - flowing air and delivers the highest power gains in most cases. This media is perfect for street andor track use. Its inverted top makes for more filter surface area, resulting in longer service intervals. One - Piece Housing The one - piece sealed housing, constructed of heat - resistant XLPE (cross - linked polyethylene) polymer, features our patent - pending filter - to - housing interface. Its innovative design minimizes the total number of parts, making for an easy installation. A large, clear sight window allows for hassle - free filter inspection, without having to disassemble your system. Dyno - Tuned Intake Tube This system features a high quality, computer - designed, dyno - tuned intake tube to achieve maximum power gains while maintaining a perfect fit. Its XLPE material is heat soak resistant and extremely durable. Hassle - Free Installation This is a direct fit intake system that utilizes factory mounting points and requires no cutting or modifications. All necessary clamps, couplings, and hardware are included. The silicone bellows coupling absorbs excessive engine movement and is flexible for a secure and easy install.